WO2012020331A1 - Systèmes et procédés pour la diversité de transmission de canaux précodés dft - Google Patents

Systèmes et procédés pour la diversité de transmission de canaux précodés dft Download PDF

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Publication number
WO2012020331A1
WO2012020331A1 PCT/IB2011/051794 IB2011051794W WO2012020331A1 WO 2012020331 A1 WO2012020331 A1 WO 2012020331A1 IB 2011051794 W IB2011051794 W IB 2011051794W WO 2012020331 A1 WO2012020331 A1 WO 2012020331A1
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Prior art keywords
block
symbols
subcarriers
transformed
antenna
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PCT/IB2011/051794
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English (en)
Inventor
Jung-Fu Cheng
Dirk Gerstenberger
Robert Baldemair
Daniel Larsson
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Telefonaktiebolaget L M Ericsson (Publ)
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Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to CN201180049797.9A priority Critical patent/CN103155439B/zh
Priority to RU2013110839/07A priority patent/RU2575013C2/ru
Priority to EP11724036.6A priority patent/EP2603983B1/fr
Publication of WO2012020331A1 publication Critical patent/WO2012020331A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
    • H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas

Definitions

  • the invention relates to transmit diversity for discrete Fourier transform (DFT) preceded channels.
  • DFT discrete Fourier transform
  • LTE Long-Term Evolution
  • LTE uplink scheme is also sometimes referred to as Single-Carrier FDMA (SC-FDMA).
  • SC-FDMA Single-Carrier FDMA
  • the resource allocation in LTE is typically described in terms of resource blocks, where a resource block corresponds to one slot (0.5 ms) (i.e., there are two slots per subframe) in the time domain and 12 contiguous siibc arriers in the frequency domain.
  • the uplink L1/I..2 control signaling includes: (a) hybrid-automatic repeat request (HARQ) acknowledgements (ACK NACK) for received downlink data; (b) channel-status reports related to downlink channel conditions, which reports ay be used by the base station in scheduling the transmission of data in the downlink: and (c) scheduling requests indicating that the mobile terminal (a.k.a., "user equipment (UE)") needs uplink resources for uplink data transmissions, For example, after receiving downlink data in a subframe from a base station, the UE attempts to decode the data and reports to the base station whether the decoding was successful (ACK.) or not (NACK). Tn case of an unsuccessful decoding attempt, the base station can retransmit the erroneous data.
  • HARQ hybrid-automatic repeat request
  • ACK NACK channel-status reports related to downlink channel conditions, which reports ay be used by the base station in scheduling the transmission of data in the downlink
  • scheduling requests indicating that the mobile terminal a.
  • a UE should transmit uplink L1 L2 control signaling regardless of whether or not the UE has any uplink transport-channel (UL-SCH) data to transmit and. thus, regardless of whether or not the UE has been assigned any uplink resources for UL- SCH data transmission.
  • UL-SCH uplink transport-channel
  • the Physical Uplink Control Channel (PUCCH) is used for transmission of uplink L 1 L2 control signaling. Otherwise, the uplink L1/L 2 control signaling is multiplexed with the coded UL-SCH onto the Physical Uplink Shared Channel (PUSCH).
  • the L 1/12 control information (e.g., channel-status reports, HARQ acknowledgments, and scheduling requests) is transmitted in.
  • uplink resources specifically assigned for the uplink LI 12 control information on the PUCCH. These resources are located at the edges of the total available cell bandwidth. Each such resource consists of 12 "subcamers" (one resource block) within each of the two slots of an uplink subframe'.
  • LIE release-8 (Rei-8) has recently been standardized.
  • LTE Rel-8 supports bandwidths up to 20 MHz.
  • the Third Generation Partnership Project (3GPP) has initiated work on LIE release- 10 (Rel-10), One of the parts of LIE Rel-1 is to support bandwidths larger than 20 MHz.
  • LIE release- 1 One important requirement on LTE Rel- 1 is to assure backward compatibility with LTE Rei-8. This should also include spectrum
  • an LTE Rel-10 carrier wider than 20 MHz, should appear as a number of LTE carriers to an LTE Rel-8 terminal.
  • Each such carrier can be referred to as a Component Carrier (CC).
  • CC Component Carrier
  • CA Carrier Aggregation
  • CA implies that an LTE Rel-10 terminal can receive multiple CCs, where the CCs have, or, at the least, have the possibility to have, the same structure as a Rel-8 carrier.
  • the CA PUCCH is based on DFTS-OFDM for a UE supportin more than 4 ACK/NAC bits.
  • the multiple AC /NAC bits may also include scheduling request (SR) bits) are encoded to form 48 coded bits.
  • the 48 coded bits are then scrambled with cell-specific (and possibly DFTS-OFDM symbol dependent) sequences.
  • the first 24 bits are transmitted within the one slot and the other 24 bits are transmitted within a second s!ot.
  • the 24 bits per slot are converted into 12 QPSK symbols, spread across five DFTS-OFDM symbols, DFT precoded and transmitted within one resource block (bandwidth) and f ve DFTS-OFDM symbols (time).
  • the spreading sequence is UE specific and enables multiplexing of up to five users within the same resource block.
  • a demodulation reference signal is also transmitted in each slot.
  • the reference signal comprises a reference sequence.
  • a "reference sequence" may represent, any information transmitted by a transmitting device to permit or otherwise facilitate the demodulation, by a receiving device, of data associated with the reference sequence (e.g., data transmitted with the reference sequence).
  • the reference sequence may represent a cyclic shifted ⁇ A ⁇ AC sequence (e.g., the computer optimised sequences in 3GPP TS 36.21 1 ).
  • an orthogonal cover code of length two can be applied to the reference signals.
  • particular embodiments of the disclosed solution provide a transmission method and apparatus that combines the benefits of DFT precoding and transmit diversity coding for PUCCH transmission.
  • particular embodiments provide an improved transmit diversity coding method and apparatus for DFTS-OFDM PUCCH with minimal impact on multiplexing capacity.
  • the improved transmit diversity method and apparatus has the feature of employing frequency-domain separation for the payload signals as well as the time- domain orthogonal spreading separation ami or sequence phase shift separation.
  • a transmit diversity coding method for DPT precoded channels includes producing a block of data symbols and transforming the block of data symbols to produce a first block of transformed symbols and a second block of transformed symbols.
  • a first antenna of a mobile terminal is used to transmit, during a slot of a subframe of a radio frame and using only a first set of subcarriers, the first bl ck of transformed symbols.
  • the first antenna is also used to transmit a first reference sequence during the same slot.
  • a second antenna of the mobile terminal is used to transmit, during the same slot and using only a second set of subcarriers, the second block of transformed symbols.
  • the second antenna is also used to transmit a second reference sequence during the same slot.
  • the first set of subcarriers is orthogonal with the second set of subcarriers. Additionally, the first reference sequence and the second reference sequence may be transmitted using a third set of subcarriers that comprises that first set of subcarriers and the second set of subcarriers.
  • the method also includes producing a second block of data symbols and transforming the second block of data symbols to produce a third block of transformed symbols and a fourth block of transformed symbols.
  • the method also includes (i) using the first antenna to transmit, during a second slot of the subframe, the third block of transformed symbols and the first reference sequence, and (ii) using the second antenna to transmit, during the second slot, the fourth block of transformed symbols and the second reference sequence.
  • the third block of transformed symbols may be transmitted using a fourth set of subcarriers and the fourth block of transformed symbols may be transmitted using a fifth set of subcarriers that is orthogonal with the fourth set of subcarriers.
  • the first and fifth sets of subcarriers consist only of even indexed subcarriers and the second and fourth sets of subcarriers consist only of odd indexed subcarriers. In other embodiments, the first and fifth sets of subcarriers consist only of'odd indexed subcarriers and the second and fourth sets of subcarriers consist only of even indexed subcarriers.
  • the first reference sequence may be orthogonal to the second reference sequence.
  • the first reference sequence may be a cyclic shift of the second reference sequence.
  • the step of transforming the block of data symbols includes the following steps: dividing the block of data symbols into at least a first sub- block and a second sub-block; applying a discrete Fourier transform (DFT) to the first sub-b!ock to produce the first block of transformed symbols; and applying a discrete Fourier transform (DFT) to the second sub-block to produce the second block of transformed symbols.
  • DFT discrete Fourier transform
  • the block of data symbols consists of twelve data symbols.
  • the step of transforming the block of twelve data symbols may include: dividing the block of twelve symbols into first sub-block of six symbols and a second sub-block of six symbols; applyin a DFT of size six to the first sub-block of six symbols to produce the first block of transformed symbols; and applying a DFT of size six to the second sub-block of six. symbols to produce the second block of transformed symbols.
  • the step of transmitting the first block of transformed symbols includes mapping each symbol within the first block of transformed symbols to a particular subcarrier within the first set of subcarriers and applying an inverse fast Fourier transform (IFFT) to the first block of transformed symbols.
  • the step of transmitting the second block of transformed symbols may include mapping each symbol within the second block of transformed symbols to a particular subcarrier within the second set of subcarriers and applying the IFFT to the second block of transformed symbols.
  • a transmit diversity apparatus for discrete Fourier transform (DFT) precoded channels includes a first antenna, a second antenna, and a data processor coupled to the first antenna and the second antenna.
  • the data processor is configured to: (a) produce a block of data symbols from a set of message bits, (b) transform the block of data symbols to produce a first block of transformed symbols and a second block of transformed symbols; (c) use the first antenna to transmit, during a slot of a subframe of a radio frame, the first block of transformed symbols and a first reference sequence; and (d) use the second antenna to transmit, during the slot, the second block of transformed symbols and a second reference sequence.
  • DFT discrete Fourier transform
  • the data processor may further be configured such that (i) the first block of transformed symbols is transmitted using a first set of subcarriers, (ii) the second block of transformed symbols is transmitted using a second set of subcarriers that is orthogonal with the first set of subcarriers, and (Hi) the first reference sequence and the second reference sequence are transmitted using a third set of subcarriers that comprises that first set of subcarriers and the second set of subcarriers.
  • particular embodiments of the disclosed solution provide a mobile terminal comprising any one of the herein described transmit diversity apparatuses for discrete Fourier transform (DFT) precoded channels.
  • DFT discrete Fourier transform
  • FIG. 1 illustrates a particular embodiment of a wireless communication system that supports transmit diversity coding for PUCCH transmissions.
  • FIG. 2 is a flow chart illustrating a process for transmit diversity coding of DFTS-OFDM PUCCH
  • FIGS. 3A,3B,4A, and 4B illustrate various snbearrier mappings according to particular embodiments.
  • FIG. 5 illustrates data summarizing the performance of a transmit diversity method according to particular embodiments.
  • FIG. 6 is a flow chart illustrating example processes for implementing certain steps shown in FIG. 2.
  • FIG. 7 is a block diagram of a particular embodiment of an apparatus for transmit diversity coding of DFTS-OFDM PUCCH.
  • FIG. 8 is a block diagram of a DFT module that may be utilized in particular embodiments of the apparatus shown in FIG. 7.
  • FIG . 9 is a block diagram of an alternative embodiment of the apparatus shown in FIG. 7.
  • FIG. 1.0 is a block diagram of a mobile terminal. DETAILED DESCRIPTION
  • FIG. 1 illustrates a mobile terminal 102 having multiple antennas (e.g., antenna 1 1 1 and antenna 12) and communicating wirelessly with a network 1 10.
  • Particular embodiments of mobile terminal 102 provide an improved transmit diversity coding process for DFTS-OFD PUCCH.
  • FIG 2 is a flow chart illustrating an example of such a process 200 that may be implemented by particular embodiments of mobile 1 2.
  • Process 200 assumes that mobile terminal 102 includes only two antennas: antenna 1 1 1 and antenna 1 12, but the described solution is not limited to two antennas as more than two antennas can be used.
  • Process 200 may begin in step 202 where a media-access control (MAC) layer of mobile terminal 1 2 generates message bits (e.g., control information such as ACK ACK bits, ACK/NAC . bits plus a schedulin request bit, etc).
  • the message bits are encoded into a block of B bits (e.g., the message bits may be coded to form a block of 48 coded bits).
  • the block of coded bits is scrambled.
  • the scrambling sequence generator can for example be initialized with at the start of each subframe.
  • a set of data symbols is produced from the block of scrambled bits.
  • a first sub-set of the block of scrambled bits e.g., 24 of the 48 bits
  • a first block of N data symbols e.g., 12 data symbols
  • a second sub-set of the block of scrambled bits e.g., the other 24 of the 48 bits
  • the block of scrambled bits may be QPSK. modulated to produce two blocks of complex- valued modulation symbols: d(0),...,d(N-l) and d(N) d(2N- l ).
  • the set of data symbols is divided into two blocks: a first block of data symbols (e.g., d(0),... ,d(N-l )) and a second block of data symbols (e.g., d(N),...,d(2N-l)).
  • the first block will be transmitted during the first slot of a subframe and the second bock will be transmitted during the second slot of the subframe.
  • the first block of data symbols is transformed to produce DFT- precoded data (.e.g., in some embodiments, prior to transforming the block of data symbols, each data symbol is multiplied by a value (w(i))) .
  • the first block of data symbols is transformed to produce a first block of transformed data symbols and a second block of transformed data symbols.
  • an antenna 1 1 1 of mobile terminal 102 and a first set of subcarriers are used, during the first slot of the subframe, to transmit the first block of transformed data symbols.
  • antenna 1 1 1 is used, during the first, slot of the subframe, to transmit a first reference sequence.
  • antenna 1 J 2 of mobile terminal 102 and a second set of subcarriers are used, during the first slot of the subframe, to transmit the second block of transformed data symbols.
  • antenna 1 12 is used, during the first slot of (he subframe, to transmit a second reference sequence.
  • the first set of subcarriers is orthogonal with the second set of subcarriers.
  • FIG. 3 A the even indexed subcarriers (i.e., ft), f2, ..., f10) are used to transmit the first block of transformed data symbols, but (he odd indexed subcanier are set to zero, and the odd indexed subcarriers (i.e., f1 , f3. ... , f11 ) are used to transmit the second block of transformed data symbols, but the even indexed subcarrier are set to zero (in the example, antenna port 0 corresponds to antenna 1 1 1 and antenna port 1 corresponds to antenna 112).
  • this provides the feature of frequency-domain separation for the payload signals (i.e., the first and second blocks of transformed data symbols) and lime-domain orthogonal spreading separation and . or sequence phase shift separation.
  • the payload signals i.e., the first and second blocks of transformed data symbols
  • lime-domain orthogonal spreading separation and . or sequence phase shift separation may be transmitted using ail of the twel e available subcarriers.
  • the first reference sequence should be orthogonal with the second reference sequence.
  • the reference sequences need not be orthogonal. In such embodiments, it would be advantageous to transmit the first reference sequences using a set of subcarriers and transmit the second reference sequences using a set of subcarriers that are orthogonal to the subcarriers used to transmit the first reference sequence.
  • step 18 (he second block of data symbols is trans formed to produce DFT- preceded data.
  • the second block of data symbols is transformed to produce a third block of transformed data symbols and a fourth block of transformed data symbols
  • step 220 ante na 1 1 1 and a third set of subcarriers are used, during the second slot of the subf ame, to transmit the third block of transformed data symbols.
  • step 221 antenna 1 1 1 is used, during the second slot of the subframe, to transmit the first reference sequence.
  • antenna 112 and a fourth set of subcarriers are used, during the second slot of the subframe, to transmit the fourth block of transformed data symbols.
  • antenna 1 12 is used, during the second slot of the subframe, to transmit the second reference sequence.
  • FIG. 3B Ad vantageously, (he third set of subcarriers is orthogonal with the fourth set of subcarriers. This is illustrated in FIG. 3B.
  • the even indexed subcarriers i.e., A), f2, ..., ⁇ .0
  • the odd indexed subcarriers i.e., f1 , f3, .. ,. f11
  • the even indexed subcarriers are set to zero.
  • the reference sequences may be transmitted using all of the twelve available subcarriers.
  • the first reference sequence should be orthogonal with the second reference sequence.
  • cyclic frequency offset can be introduced for different symbols as illustrated in FIGs. 4A.B.
  • indexed subcarriers i.e., fO, £, ... , fl 0
  • odd indexed subcarriers i.e., fl, f3 fl 1
  • the above described transmit diversity scheme for the DFTS-OFDM PUCCH provides substantial link performance gains.
  • the required operating SN ' R for these different schemes are determined based on the following performance requirements:
  • the performance of the transmit diversity scheme is summarized in FIG. 5. It can he observed that, with two antenna ports, link performance gains of arotind 2-2.5 dB can be obtained. Transmit diversity with three or four antenna pons can offer further link performance gains.
  • FIG. 6 illustrates (a) exemplary steps 602-606 that may be performed in implementing step 212 of process 200 and (b) exemplary steps 608-610 that may be performed in implementing step 214 of process 200.
  • the first block of M data symbols is divided into two equal sized sub-blocks: a fust sub- block of M/2 data symbols and a second sub-block M/2 data symbols.
  • a DFT of size M/2 is applied to the first sub-block of data symbols to produce the first block of transformed data symbols.
  • a DFT of size M 2 is applied to the second sub-block of data symbols to produce the second block of transformed data symbols.
  • each data symbol within the first block of transformed data symbols is mapped to a particular subcarrier within the first set of subcarriers.
  • an inverse fast Fourier transform IFFT is applied to the first block of transformed data symbols.
  • FIG. 7 illustrates a transmit diversity coding apparatus 700 for DFTS-OFDM PUCCH, according to an embodiment.
  • apparatus 700 may receive message bits
  • MAC media-access control
  • encoder 702 for coding the message bits into a block of bits A(0).b(1),.... b(B-1) according to Section 5.2.2.6.4 of 3GPP TS 36.212, where
  • the bits may be coded to form a block of 48 coded bits.
  • these message bits may consist of HARQ ACK/NACK bits. In another embodiment, the message bits may consist of HARQ AC /N AC K bits
  • an a scheduling request bit (e.g., bit o 0 ,o 1 ,o 2 , o 3 ,,...,o 0 -2 ) an a scheduling request bit (e.g., bit ).
  • the scheduling request bit shall be set to 1 to request scheduling and 0 otherwise.
  • the bits corresponding to HARQ feedback may have been obtained by a logical AND operation of several individual HARQ feedback bits. This embodiment corresponds to partial bundling where multiple HARQ feedback bits are logical AND combined and only one bit is transmitted per bundle.
  • Apparatus 700 includes a scrambler 704 for scrambling the block of coded bits *( ).*d) bib 1) ,
  • the scrambler may use a cell-specific (and possible DFTS-OFDM symbol dependent) sequence to produce a block of B scrambled bits
  • c(i) is given by section 7.2 of 3GPP TS 36.21 1.
  • the scrambling sequence generator can for example be initialized with at the start of each subframe. in one embodiment illustrated in FIG. 7, the output from encoder 702 may be divided into two sub-blocks: a first sub-block and a second sub- block The first sub-block is repeated times and the second sub-block is repeated times. The repeated coded bit sequence is then scrambled by the scrambling code sequenc with initialization method disclosed above.
  • Apparatus 700 also includes a symbol generator 706 that receives the coded and scrambled bits, uses a first set of those bits (e.g., 24 of the 48 bits) to produce a first block of N data symbols 791 (e.g., 12 data symbols) and uses the other bits (e.g., the other 24 of the 48 bits) to produce a second block of N data symbols 792.
  • symbol generator 706 may be a modulator that QPSK modulates the bits to produce a block of complex-valued data symbols: d(0) .. ,d(2 A ' ** - 1 ), which may be divided into two blocks of complex- valued modulation symbols: a first block and
  • the block of data symbols is spread with an orthogonal sequenc w cilantro M , (/ ' ) , thereby producing, in total, a block of complex- valued data symbols y(0),...,,y(M»y,» b « ] ) according to:
  • the block of complex-valued data symbols y(0),... y( A , >mh -1 ) is divided into blocks where in the example shown, the number of blocks
  • the first block consists of
  • the second block consists of
  • five of the ten blocks of data symbols are processed by a set of DFTs 708 and a set IFFTs 710, which set of IFFTs consists of a first subset of IFFTs 71 1 and a second subset of IFFTs 712.
  • the other five blocks of data symbols are processed by a set of DFTs 718 and a set of IFFTs 720, which set of IFFTs consists of a first subset of IFFTs 721 and a second subset of IFFTs 722.
  • the data processed by DFTs 708 and IFFTs 710 is transmitted in the first slot of a subframe and the data processed DFTs 718 and IFFTs 720 is transmitted in the second slot of the subframe.
  • DFT 708a will transform precede the block of data symbols y(0), ... ,y( ⁇ ⁇ " ⁇ « 1 ).
  • the transform precoding applied by the DFTs is applied according to:
  • antenna port p corresponds to antenna 1 1 1
  • antenna pott 1 corresponds to antenna 1 12. It can be seen from the above computation that the p-th block may have nonzero values at in indices [p, p+P, p-i-2P, ... j and zeros at all other indices. This is illustrated for the case of P ⁇ in FIGs. 3 A and 3B.
  • DFT 708a will produce two blocks of transformed data symbols: a first block of transformed symbols z (m lO) z m ⁇ N - ) and a second block of transformed symbols r"'(0),.,., 2 i " (-V* n - 1) .
  • the first block of transformed symbols s (0) s m (N - i) has nonzero values at in indices [ ⁇ , 2, 4, ...] and zeros at ail other indices
  • the second block of transformed symbols has nonzero values at in indices [ 1, 3, 5, ...] and zeros at ail other indices.
  • FIG. 8 illustrates an example implementation of D!FT 708a.
  • DPI " 708a includes two 6 point DFTs: DPI " 802 and DFT 804.
  • the input to DFT 802 is y(0), y(2), y(4), y(6), y(8). y(10).
  • DFT 802 transforms this input in the conventional manner to produce a first block of six transformed symbols z(0), z(2), z(4), z(6), z(8), z(10).
  • This first block of six transformed symbols, together with six Os for padding, are provided to twelve consecutive inputs of an [FFT 71 la, as shown, Likewise the input to DFT 804 is y(l), y(3), y(5), y ⁇ 7), y(9), y ⁇ l 1).
  • DF T 804 transforms this input in the conventional manner to produce a second block of six transformed symbols z( l), z(3), z(5), z(7), z(9), z( l I).
  • This second block of six transformed symbols together with six Os for padding are provided to twelve consecutive inputs of an IFFT 712a as shown,
  • the output of IFFT 71 l a is coupled, via conventional transmission components, to antenna port 0 and the output of IFFT 712a is coupled, via conventional transmission components, to antenna pon 1 so that the first, and second blocks of transformed symbols are transmitted via antennas 11 1 and 1 1 , respectively, during the first slot of the subframe.
  • a first set of subcarriers will be used to transmit the first block of transformed symbols and a second set of subcarriers will be used to transmit the second block of transformed symbols, where the first set of subcarriers is orthogonal with the second set of subcarriers (see e.g., FIG. 3 A),
  • the transform preceding procedure described above may be modified such that, the transform precoding applied by the DFTs is applied according to:
  • this procedure results in P blocks of complex-valued symbols , where
  • the / h block of complex-valued symbols is to be transmitted on antenna port /;
  • An illustration of the per-SC-FDMA-symbol cyclic frequency offset for the case of P m 2 is given in FIGs 4AJ8.
  • the cyclic frequency offset step A can also be larger than 1.
  • the extended transform precoding is given by
  • P different reference sequences may be used to generate the demodulation reference signals.
  • P a first reference sequence
  • RS 2 a second reference sequence
  • RS 1 is transmitted using antenna port 0
  • RS2 is transmitted using antenna port I .
  • Each RS may be transmitted once or twice during a slot, depending on whether normal or extended cyclic prefix ( P) subframes are being used.
  • P normal or extended cyclic prefix
  • normal CP subframes ai'e being used.
  • Hie same demodulation reference signal generation for Format 2 PUCCH is applied except the orthogonal sequences are given in table III, below:
  • RS 1 and RS2 may be of length Suitable sequences are CAS AC
  • sequences of length or computer-optimized sequences From one base sequence additional orthogonal sequences can be derived by cyclic shif ing the base sequence as described in 3 GPP TS 36.21 1 , "Physical Channel and Modulation.' 1 For normal CP with per slot time-domain block spreading can be applied to increase the number of a vailable RS sequences or alternatively to increase the cyclic shirt distance between RS sequences
  • RS 1 and RS2 may be transmitted on the same set of subcarriers.
  • RSI and RS2 may be orthogonal.
  • RSI may be a cyclic shift of the second reference sequence.
  • the reference sequences may be mapped in a distributed fashion, like the data payload as discussed above. That is, the RS of the different antenna ports are mapped to different frequency-domain combs. For example, for
  • RS for antenna port 0 occupies the even-indexed sub- carriers in even-indexed SC-FDMA symbols and in odd-indexed sub-carriers in odd- indexed SC-FDMA symbols (or vice versa): and RS signal for antenna port 1 (e.g., RS2) occupies the odd-indexed sub-carriers in even-indexed SC-FDMA symbols and in even-indexed sub-carriers in odd-indexed SC-FDMA symbols (or vice versa).
  • FIG. 9 illustrates an alternative embodiment of the transmit diversity coding apparatus shown in FIG. 7.
  • apparatus 900 is nearly identical with apparatus 700. with the exception that, in apparatus 700 (here is a single scrambler and symbol generator, whereas, in apparatus 900, a scrambler 704 and a symbol generator (SG) 706 are placed in each branch corresponding to an SC-FDM A symbol.
  • apparatus 700 here is a single scrambler and symbol generator
  • SG symbol generator
  • the scrambling code can be made SC-FDMA symbol dependen by initializing each scrambler shown in FIG. 9 at the beginnin of each slot with a seed that depends on the slot or subframe number.
  • the bits in the first and second slot are then scrambled by a * an n Ad , element long sequence, respectively.
  • sequence generator is initialized at the beginning of each slot with a seed that depends on the slot or subframe number.
  • the scrambled bits are then mapped to QPS symbols and in each SC-FDMA K symbols are transmitted.
  • the scrambling sequence generator is initialized at the beginning of each subframe with a seed that depends on the subframe number.
  • the scrambled bits are then mapped to QPSK symbols and in each SC-E-'DMA s Q.PS symbols are transmitted.
  • FIG. 10 illustrates a block diagram of an example mobile terminal 102 in which transmit diversity coding apparatus 700 and/or transmit diversity coding apparatus 900 may be implemented.
  • terminal 1.02 may include: a data processor 1002, which may include one or more
  • microprocessors and/or one or more circuits such as an application specific integrated circuit (ASIC), Field-programmable gate arrays (FPGAs), etc.
  • ASIC application specific integrated circuit
  • FPGAs Field-programmable gate arrays
  • a transmitter and a receiver 1004 coupled to antennas 1 1 1 and J 12 via antenna port 0 (pO) and antenna port 1 (pi ). respectively, for wireless communications; input/out devices 1021 (e.g., a display screen 1022); a storage system 1006, which may include one or more nonvolatile storage devices anchor one or more volatile storage devices (e.g., random access memory (RAM)).
  • data processor 1002 includes a microprocessor
  • computer instructions 1008 i.e., computer readable code means
  • Configuration parameters 1010 may also be stored.
  • the computer instructions 1008 may be embodied in a computer program stored using a computer readable means, such as, but not limited, to magnetic media (e.g., a hard disk), optical media (e.g.. a DVD), memory devices (e.g.. random access memory), etc.
  • computer instructions 1008 are configured such that when computer instructions 1008 are executed, computer instructions 1008 cause mobile terminal 102 to perform steps described above (e.g., steps describe above with reference to the flow charts shown in FIGs. 2 and 6).
  • mobile terminal 102 is configured to perform steps described above without the need for computer instructions 1008. That is, for example, data processor 1002 may consist merely of one or more ASICs.
  • the features of the present invention described above may be implemented in hardware and/or software.
  • the functional components of apparatus 700 and/or apparatus 900 described above may be implemented in terminal 102 by processor 1002 executing computer instructions 1008, by processor 1002 operating independent of any computer instructions 1008, or by any suitable combination of hardware and/or software.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un appareil de transmission qui combinent les avantages d'un précédent DFT et d'un codage de diversité de transmission pour la transmission PUCCH. Dans un aspect, l'invention obtient un procédé et un appareil améliorés de codage de diversité de transmission pour un PUCCH DFTS-OFDM avec un impact minimal sur la capacité de multiplexage. Dans un mode de réalisation, le procédé et l'appareil améliorés de diversité de transmission ont la fonctionnalité d'employer une séparation de domaine de fréquence pour les signaux de charge utile.
PCT/IB2011/051794 2010-08-13 2011-04-25 Systèmes et procédés pour la diversité de transmission de canaux précodés dft WO2012020331A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201180049797.9A CN103155439B (zh) 2010-08-13 2011-04-25 用于dft预编码的信道的传送分集的系统和方法
RU2013110839/07A RU2575013C2 (ru) 2010-08-13 2011-04-25 Системы и способы разнесения передачи для предварительно кодированных посредством дискретного преобразования фурье каналов
EP11724036.6A EP2603983B1 (fr) 2010-08-13 2011-04-25 Systèmes et procédés pour la diversité de transmission de canaux précodés dft

Applications Claiming Priority (4)

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US37353110P 2010-08-13 2010-08-13
US61/373,531 2010-08-13
US13/016,205 US8824267B2 (en) 2010-08-13 2011-01-28 Systems and methods for transmit diversity for DFT precoded channels
US13/016,205 2011-01-28

Publications (1)

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WO2012020331A1 true WO2012020331A1 (fr) 2012-02-16

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EP (1) EP2603983B1 (fr)
CN (1) CN103155439B (fr)
WO (1) WO2012020331A1 (fr)

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EP2603983B1 (fr) 2019-06-19
RU2013110839A (ru) 2014-09-20
US20120039158A1 (en) 2012-02-16
EP2603983A1 (fr) 2013-06-19
US8824267B2 (en) 2014-09-02
CN103155439B (zh) 2016-10-26
CN103155439A (zh) 2013-06-12

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